savant syndrome
noun
: the condition in which a person having a developmental disability (such as autism spectrum disorder or intellectual disability) exhibits exceptional skill or brilliance in some limited field (such as mathematics or music)
People with savant syndrome, for example, often score low on intelligence tests but have an island of brilliance—some incredible ability, as in computation, drawing or musical memory …—David G. Myers
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Merriam-Webster unabridged
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